Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos anos tinha uma fórmula de Grand Prix?
 ###Tabelas: CREATE TABLE match_the_dealer (match_the_dealer_id AUTO_INCREMENT PRIMARY KEY, Number of Decks INT, Non-Suited Match VARCHAR, Double Non-Suited Match VARCHAR, Suited Match VARCHAR, Suited + Non-Suited Match VARCHAR, Double Suited Match VARCHAR, House Edge VARCHAR) CREATE TABLE torneo_apertura (torneo_apertura_id AUTO_INCREMENT PRIMARY KEY, Position INT, Team VARCHAR, Played INT, Wins INT, Draws P.K. Wins / P.K. Losses VARCHAR, Losses INT, Scored INT, Conceded INT, Points INT) CREATE TABLE islands_over___square_miles__ km_ (islands_over___square_miles__ km__id AUTO_INCREMENT PRIMARY KEY, Rank INT, Islands Name VARCHAR, Area (sqmi) INT, Area (km 2 ) INT, Location VARCHAR, Population (2000) VARCHAR) CREATE TABLE winners_of_the_circuit_des_ardennes (winners_of_the_circuit_des_ardennes_id AUTO_INCREMENT PRIMARY KEY, Year INT, Formula VARCHAR, Driver VARCHAR, Constructor VARCHAR, Location VARCHAR, Report VARCHAR) CREATE TABLE 2011_junior_manx_grand_prix_practice_times__&__leaderboard (2011_junior_manx_grand_prix_practice_times__&__leaderboard_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Rider VARCHAR, Sat 20 Aug VARCHAR, Mon 22 Aug VARCHAR, Tues 23 Aug VARCHAR, Wed 24 Aug VARCHAR, Thurs 25 Aug VARCHAR, Fri 26 Aug VARCHAR)  
SELECT COUNT Year FROM winners_of_the_circuit_des_ardennes WHERE Formula = grand prix